Steam Boilers, Engines, Nozzles and Turbines
Boiler H.P. is defined as the

Steam evaporation rate per kg of fuel fired
Work done by 1 kg of steam at saturation condition
The evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam
Work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam

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Steam Boilers, Engines, Nozzles and Turbines
In accelerated circulation type boiler

Water is converted into steam in one pass without any recirculation
Feed pump is employed to supplement natural circulation in water wall type furnace
Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

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